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determining variables

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by

cristie praeger

on 3 February 2016

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Transcript of determining variables

How to determine variables...
EXPERIMENTAL DESIGN
Why Do Experiments?
EVERY EXPERIMENT HAS 3 TYPES OF VARIABLES
THE INDEPENDENT VARIABLE
The independent variable is the part of the experiment that you are changing.
Another way to think about it is if you were setting up an experiment, what would be the thing you do differently to one of the set-ups?
THE DEPENDENT VARIABLE
The dependent variable is the part of the experiment you're measuring.
Another way to think about it is that it's the outcome of your experiment.
Scientists use experiments to find out more about the world. When they set their experiments up, they think carefully about their goal and what they're trying to find out. This is why variables are very important.
THE INDEPENDENT VARIABLE
THE DEPENDENT VARIABLE
THE CONTROLLED VARIABLES OR CONSTANTS
How does amount of light affect plant growth?
When you set this experiment up, you'd set up plants in different places with different amounts of light. You see... it's the thing YOU CHANGE or what's different between each set up.
The independent variable is usually found in the first part of an experimental question.
In an experimental question, the dependent variable is often at the end.
The Independent Variable

The Dependent Variable

The Controlled Variables or Constants
How does amount of light affect plant growth?
In your experiment, this would be the thing you're measuring or observing. It's your outcome!
Let's Review!
How does amount of light affect plant growth?
The Constants
(these are
"controlled"
variables)
The Constants are all the things you keep the same between the setups.
If the constants are not kept the same, it could affect the outcome of your experiment and therefore be an error. This is why they're called CONTROLLED... you have to CONTROL them so they don't affect your experiment.
The constants are not usually things listed in the experimental question, but things you should consider as part of your setup.
How does amount of light affect plant growth?
INDEPENDENT VARIABLE=
amount of light

DEPENDENT VARIABLE=
plant growth

CONSTANTS=
amount of water
type of plant
container
amount of soil
amount of time
The End
Some variables are UNCONTROLLED
These are things that may affect your experiment, but you have no ability to change them.
EX:
human error by others
plant death
weather
Full transcript